I have a 1967 I-504 with two auxiliary valves. The valves do not have a part such as yours nor as the one on Charles' F-504 ( pictured in a post below) bolted to it. Mine are simply the " inner" and "outer" valves. There is nothing in the 504 parts book showing power beyond covers for the valves. However in my 2000 loader operators manual there is a diagram showing something such as yours. It is called a Transfer Block and Cover. The transfer block is used instead of an auxiliary valve. It is bolted at the same place as your valve is now. The cover has the port for supplying oil flow to a bank of valves mounted on the right hand side loader frame. Return oil from those valves is routed back to a port in the rear of the transfer block to be dumped into the tractor rear frame. What puzzles me is why there is no provision for returning oil to tractor reservoir. You say that it may have had a loader on it. Perhaps when the loader was removed they merely plugged the supply port and the return oil port wherever it was. You can do several things. 1. Take the plug out and install a hose to dump oil back into tractor transmission housing somewhere. 2. Put a loader on it with hose to loader valves and then return oil as stated above. 3. Obtain a cover (such as seen on Charles tractor) to replace yours. 4.Get an "outer" valve and stack on top of yours and plumb it up to more auxiliary outlets. Charles' tractor has two "inner" valves on it. Outer valves are more plentiful at salvage yards than were inner valves. I can scan and send you diagram from loader manual if you like. Reply to my e-mail if interested.
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